Microsoft restricts Claude Fable 5 internally over data retention

Microsoft is restricting employee use of Anthropic's Claude Fable 5 while its legal teams assess the model's data-retention requirements. The model remains available to customers through GitHub Copilot and Microsoft Foundry, but it is absent from the internal model picker used by Microsoft employees. Other Claude models remain available internally because they operate under Zero Data Retention rules. Fable 5 retains prompts and outputs for 30 days to support safety classifiers, and flagged data may be kept longer. The decision shows how a model provider's safety and retention policies can create immediate compliance limits even for a major distribution partner.

Key details: June 10, 2026, Microsoft employee access restricted, Customers retain access through GitHub Copilot and Foundry, Data-retention requirements under legal review.

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